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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701e4662a134256947f6c4eebcc0b07a8cece974e4d834035549ca3b7b4158b2' 
  AND token = '04W0kLqdDPjtCx9MPFRQXdv14Iah+mEFIoqKAeODK7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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