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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a8cd4c13c8dec8fba4c0a780015eac03c20ff3ad5b0b73f4fe7924e40b5c2d' 
  AND token = '2h5x8GMyjIzEU9u8pchFQk2TGqCKR8Dd9fuTEHHraQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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