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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8a95f099d0a1c7644037dfe0828f8c13a5f03462491deb9eb0a273abe30285' 
  AND token = 'J1DoAi9oHMRMj6bCffxPPHLnnxu3IokU9dm3BTKPzoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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