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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e703fa8d2fba86ec96066811f371fa06d027eb662edc0e6c353cebb1eb92fc4' 
  AND token = 'lUTs7zp7qhf/H7xYeMGgSoDkfdxgLBIiCf6jBOca6v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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