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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8109fb0f7a4882f3e1a698d7bd6c6dad19c3033492ea8478f007c4f5dea4485a' 
  AND token = 'cEr67ifIchKKWRoc/GHC1SFWng3bAJXVcF81ERpin0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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