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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3376ef41f4589491da0a7deabe81ea7b3ef586026915e5a2af24ab272f6d11fd' 
  AND token = 'P4w1ZK8fBJpj0e7SRcfOjrsloGpTKybWU5k9u8tEvas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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