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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51bfbb3cfa5db09b97369bca5428864592be7a79b33c30c4be75dc79216d1b75' 
  AND token = 'PO4sJtWzICz3UrbhA/VDw1idZ7dqqL1y3LwZuC3KMjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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