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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60080b1b4104796a856e0974b1cccae999d06a0e892ca922bc62e411b8f996d1' 
  AND token = 'ec1/3Ry+wiv0I0vjFBy7tTbUt6VBMnAui8/Y45R/hac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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