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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8583c703b02997187fcd8b57bb4c0f483f727f91ade6b36d5181d6bafc17968e' 
  AND token = 'QLY4DUZOdFPce/ShXQBI4QTZ+EoS9LUkuIlUeb3YcTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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