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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a295a189ac14c65a5bb3c0daf87d95a7f5dee32ad40f00527c8f9921f1a62cc' 
  AND token = '7KdkI+D+ZAippw9vDdguQ6f4hP8bhM7qqONlcA0kRcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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