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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd00084d3c049d19d135e4958e09af61b5ad3c736d0535cc9d1ae296c761e97e' 
  AND token = 'CJKQSSRzcW5gwWJENTe6qQBgCZvAWjgu5WIQAPLPfNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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