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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe160720ab55231c6a7eb2a4b5da49597eb10da7c8819aab57cc74a089759fa8' 
  AND token = 'o6iE8ypMI0L4yVcATZosAnkQZJdLomijEIxF4Yo1U8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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