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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce8a43a7570cd71ab0368d8618451d44cf5164b08b7e07b5cd3ee60498f95c4' 
  AND token = 'ceKWhmyB9/IZra2O2BD4l5/YIj5ENiOMJsOmjNInVoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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