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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a81f6bf38b9cf2d28acd987af84968a5c912d02c0a8afdc89ed6f9ad5d26edf' 
  AND token = 'aainVGTYUsPpYzpUWFA3deyuo5HW7kd8NVJGS6qmxDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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