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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7616291437c733313ca1bc97c76bdf5f25d225e0646e88ffa109460d79a436' 
  AND token = 'xsS+VytpfxOQdU2zTXDKVlfwL6jsmb4lxLA66y1zGP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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