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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55126d5ac659ec6ac4b25c61e53454d11aea83db89ae2cb216170be2e49409db' 
  AND token = 'zFjHtAw0eRoIOcxDhf580k47r4YbRU4nQE9kcxBuEDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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