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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcca5014432c9e0cec23b21ec9f8039efb069fcf0ef6cd0c6192503800ed11ec' 
  AND token = 'Zb1zSaM2KM9+FLf570xwvzidBP48twV0d91/TA9DqZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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