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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb27ba7d6c580dceb90cdf845be1ba4d61d4e2032e2dd1b18c2f5f62263b6a8' 
  AND token = 'vU7cX+hr3kJXMyFClfCLRtinx5kWDcVYY8sQ/rFG7bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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