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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eeb0163ac11b4f1358cf30f2b02d5bf938fad1886961a646708d6d9392d5ee' 
  AND token = '40F6gCY81wC3MWcNiIXbfL5Lin5ggFa8lT/g/zKtHks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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