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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d19bca37ca88c6949f8c9ecb27831c0c47e616b28dce40b87c9c59900e4fd0' 
  AND token = 'NUIyyOgFFTASSwqFztcvsP4jq2DeZAZ31JCwMxE/XWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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