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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19a79d6534d44043805bb6e57e22c6d5db110f16a44547b75da5502dca88d77' 
  AND token = '8mHGkQlEPWaAmVSZJK+Trf80xNw0N9elPAijqKAHzQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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