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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84126808c2777d09f25e8a75d73df5dece9cc2418c5f3c727186327e68e9ea50' 
  AND token = 'Bg8W4DfiLmnyAM/TXDgnZp0PsGfm98md/U9VJz52eGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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