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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf0053d27a97468688a783495b772d56aa37d4addb057ffba95c6e38652c8d4' 
  AND token = 'yccdAVEUNDpTfz/bwNBcgJkrQYW8wasltEk+/KsJqik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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