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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7a8c4c0ec42f977326da778766b7e15f70a29f4ccaa5d29e96b7d6f3e5f229' 
  AND token = '7HW3m7N7CHXqdLJJ2DJc56gDtgYePMKMfKUwIlSwNHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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