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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60df94228520c789950036e46bb7d4d81277a6e1e80819285e64ef6e7fd6b09' 
  AND token = 'faNGI8M4Wg4GXoVFGW/+FO40mVkcNPWMDthXKXlh0Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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