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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2feaa69ca078b30b92030c0286be475ee65fc0e3c66c3b5a969b169275919670' 
  AND token = 'XIFTJe9eb1HSK4O6u0QzLUUZchOGKkyXB5frrM/2vzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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