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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b302a4231cea66a64711e167da9001eaa2ccb4f8eb539c44f215e059376b85' 
  AND token = 'tac8X8OqGlmiCsYYWXHuo6yu9p6Uu+bdsRFy8xDG08w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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