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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7b6d36987ad3e861febad69c879066b4a985e9f7a3feb361429b32d54dcd6c' 
  AND token = 'vLT0975rtqeOtpkuYj89qpOOxsIEDlZ3g1ltR5CCcOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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