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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2bbb47b25eec109b7735d79295a83ca2c792af1afa7eb8d584c96305cac910' 
  AND token = 'p4Lv/qR0lm2xL5z/WXCySU31FsWRkqAwa38i6odPv30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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