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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad096853f3eacc73d8e4d5f68dcb8c97406ae9b298e3fabb3d56be68724923e' 
  AND token = '5pRHGpCSpWd87Zq6BZYULF9qnK2coKo9yHiL0f/aIoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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