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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02cd8d900eaea7677625e6598434f8d94edae29e7c0100b929cd346f8ccc1d8' 
  AND token = 'hdZo6sLTUQwZnGII/yOyl00Vbf4r79vpAiS134Bf3ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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