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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cc9de6a64f5baa9dd1e8eb5a6acbe96ed232f1f0fc750700967c83b87b238c' 
  AND token = 'nAJkUfUxsDN9OCjpnCNttH2AQ+aHEYlc2FsBN0Myktw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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