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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be58f1e472c8eab9e519a08cc56a250b9b1b5754e19bb2316a0f00acad7e805a' 
  AND token = 'dD8KO4o9U4JtXoYXD+/I6zVQeLtyre+sKmrXKGOKBVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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