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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb1fbb916ead6616781f76e525326fef44a563ccd0353c3388f1b9b3070cfc8' 
  AND token = 'BHlDC0Jqy+B3Fxej5QidsgTkUlCGDdUUtQDh5+MZgI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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