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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be5a9ecfeae5c474ec8df8773df8fa49be5aa6750c64e9a065e64f9c32e2611' 
  AND token = 'SulwytkC/r0wdIG8NlESQWvsf8JWIgxTmyLZYKTLCLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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