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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f724e0aa26d23a11be4d49fea74b6a5dbc856d932dc9a36b98ee30f15b9ade8d' 
  AND token = 'qPO0kYf1nxI9C2ThGAQGaiY3LVry/lzkU0uB3cesDvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}