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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b1183b6806598841e518c59aa89d184046f0cde2e35e8c6549f8f26723df71' 
  AND token = 'teCYkbOpqtcS57GnzdPMl8tr1Bad977jg8YDI9IraUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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