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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a9d9ec0157b3cc7dd83f8a086b04c4c4cfe19661f86aa55db483e26f8817b' 
  AND token = 'sqhVVe4kgVlxom0c3GurMbckcgFRBfbv/xp15sZCXtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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