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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7abfdab181b4f7ffebee8b47c2b554e255f7e019aa280d283d5fcba8d27ec8' 
  AND token = '8Z6443DNwpQvPrVhJrB50RSaxbyYiRWX+Dqlcok96uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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