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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d39ca82c52f02285fd841e615018e54f00d2bc5eff9e47536f6ce31f67d593' 
  AND token = '9czsoPUuzD7LqrNH0uSFoaY5ZdZBNnmuxqgD6pvtjs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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