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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12494e92bf5df39c6090ec75a6355acf3c2f88ee113c6798eef28b78ed81d3bf' 
  AND token = 'KRFkir/0ORGQ+euop97PddE85PC/qH8izWK77U7GAHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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