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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb5b6473dead3cd4fbcab7dbbc288d5874602afd552fa2c97e949ededc7bd7c' 
  AND token = '2ISx2TSm4ZpReEEh5049XAfIrFTINzYAFLmjt2Q1PCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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