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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aa71e924eeda19e28fce4c4d98f7e6c67ce5e2b70aa4f799b2a7050a5d9a76' 
  AND token = 'p8Uz4JvyaGVCgNV11WjBv1aI4/I8/pU3AlDEA1qETg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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