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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ab84af0f78a6dc2a8f027ac1c7f2a066a02c0a1d3528bbbda4c1814a62c11f' 
  AND token = '9Rk4wkf1vqKmfB4dTpsWv6rDml+HH2gTng23VfDsxlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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