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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f0e9c461fdfd94f40782f1d15878016440433a15d369cd4e9967b681511370' 
  AND token = 'd+xcBirntTIcpq/2Ihbc4bcl+L9Qlh4i89PeOflxqEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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