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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2e3faef6e545c5cb9e4f73196398ac5e433b3c79bcb52328b78a6c4d7459f9' 
  AND token = 'QlZtIm7wfpaSWW3pQMu26WvC70+4rc7NDz7avsddw6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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