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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f3535ea07aecacf3aaa4bf83cf288cbbbaa2a9784656974a51b956ad8e15bf' 
  AND token = '7kdFBip2cFRvCF43E267wqXsvhtubIG1iyEzh9u74T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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