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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55690955c4407a36694e83759a10cd816b43183fa25b0fc724a373e0754ce808' 
  AND token = '1faJb2I1AazZ+lYwKatKsMW8bz0KYturk+RSEfEOumU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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