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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abecce9e77f790adc0bca62b568ed012087a0c9a48d43361b129018dd02ca21' 
  AND token = 'uqOEDqnnfkg1lmumY6eLTTPGUsMZhzZTlwxgTGCq/44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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