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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf3d0088e05c8aae7d045c4e92e6b4bf2bbecc881f7610058494b9ad50af565' 
  AND token = '8A80HEQMHqnmonhS9PgF/YRFbvazbrKrn83ZXUMgiTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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