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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1df64c661e6b3233464ef6766e4bd3861834e0b84453fcc47db4f19ad4a32db' 
  AND token = 'HmvOBJwfBzsLpEtbwXU2XQ59J4oX2V6gRlR4TPtElmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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