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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf2e68f570e2edab3123adcf8c91cb0e20e4291e27d4f9dbdee56a2e2a2fbde' 
  AND token = 'cEvWOKC01/JLrZQx7RVOmaLbD9J/6G1Hl/+3vyRxzCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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