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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8ed18681deffc221a32ef09fa33494842731bc8734f040f98b7ff98b0eba4a' 
  AND token = '6MZvXi1IhE9ebgawiSvkkp1R2lp7NlHGLg6bwzj5Xzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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