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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286847096209cb8e788cd82d6fb6f596ee057f4cb2ee1c751e833bf38757d7e3' 
  AND token = 'L8lSEeuYPPy0f91/kk4pME2esaWdop98LBB8CocUoA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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