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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1637ad224b5d23064dde21d9bdd6605764e9e25550a08db6f0c371993ba1e117' 
  AND token = 'eXcTROxvjjPFiWgjtfkzWA2Q0QtP6ZLgp4ZznC4S5js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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