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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2d2aef5e7e57da81613ddc4c7705909de7ff84a5e8bee3dfe1f39df7c73b6c' 
  AND token = '3IDmdWwe7uSndNCJlF7CV5RPP9+qAZSuEosynIaoAfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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