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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb16b7a644ad753efb1644a676568fc95e57fcb2d21c4c14d220012be25970d' 
  AND token = 'lAUVT43mYgLScEUqxFt0xrtriqt43OnDrXjC1jHZ1wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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