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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed4174c8e7babb3b711b2bbd6d0fb004a2eb98fc5421f22b5e18cc50574ef10' 
  AND token = 'YaS4Z7XyUD575X/EbmZVdixR9fl6qhupyPYxqaSrtwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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