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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35cd3cd082d95db7dd8a1f90eabaa5193dc8cc37bc8bb4261b986a9cdc918434' 
  AND token = 'x2W2hmj9H96CYitjU4CYa+xnShA6knPblAlYvUUNQ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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