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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80e39a7eaea5264c1d51ee7efc51a73e12d8e2b16011ae283892d6a259f19e3' 
  AND token = 'uunzKaA1BMC6wNGukfGdwsgC9X2r/9nE8srUPJXL7qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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