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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213ddd2c5810bfc0761e90aaacf1a1be51e2f5857224b8a409e43c4eae422adc' 
  AND token = 'WZHIf4MyXNVDavF7IIeuq/FTJr5iCz9RU0g+uSyhmHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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