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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c277edf2758992a07b4904091b06bc7de35eb3e3230778ada06593d82c56c8fe' 
  AND token = 'D567Xduv2LqjYKfl/wB+XperCfD4S2+nNNDTfpDyt/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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