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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e36396248e5750c0c95e1cb71ec9d0179efb0d9a6010275bfaa5c7ed3ec055' 
  AND token = 'OHIrBeryPlv33NFJwlSihulINbwaGvR3Bfo3iQqBBiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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