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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31295e24a5d85533fc0c6e24debedef0116afa90aa502c1b8f02935d4190057' 
  AND token = 'ccb5k/Xkv9d+30SpiczP6k3Pq1aJyc3qyjYfZILotKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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