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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c099a12c84f680634a318274f0cfae6fe8a97d1c0edd6c60d833f4f300eb588b' 
  AND token = 'edrcEEB/U1bGmBWzaFaygFr82e81bNf7c7fh7OpmTyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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