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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91cb97e1798d7794786ab09d65c73deda6654ae0a0836a66c4b190934cb120e' 
  AND token = 'EG7UNaBdV32gDl4QR1wFBxZpFzAHYnb1dS70F3DMJj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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